Geometry Playground v 1.4

Geometry Playground is a free ruler and compass Java application for multiple geometries. (You will need Java 1.50 or greater to run it.) To start Geometry Playground, follow the link below.

Instructions for Geometry Playground are probably not needed, but here is the general idea:

1. Choose a geometry by selecting a tab.
2. Using the menus, choose what you want to do. You probably want to begin with the Construct menu.
3. Once you have chosen what you want to do, instructions for how to accomplish that should appear at the bottom of the screen.

Although most features of Geometry Playground are self-explanatory, there are some short (and cheesy) tutorial videos that might help you get started. They are:

1. Playground1, constructing and moving segments in Euclidean geometry.
2. Playground2, more constructions, this time in spherical geometry.
3. Playground3, measuring distances, areas, etc., and their sums, ratios, etc..
4. Playground4, display options: playing with labels, models, and scale.
5. Playground5, opening and saving files, undoing, and fixing objects.
6. Playground6, reflect, rotate, and translate.

There are some constructions saved in a .zip file, including some traditional Euclidean constructions and their counterparts in other geometries. Follow this link to download those constructions.

Do you want Geometry Playground to be offered in your language? Download Playground Messages, translate it, and send it to Daniel J. Heath. Note that "(your language)" should be translated into the word for your language in your language. For example, in English, that line reads: "languageText = English".

Arguments can be passed to Geometry Playground through the jnlp file, as showcased in file PlaygroundExample.jnlp.

• The first argument should be the URL of a saved construction, beginning with http://. When Geometry Playground finds a valid URL in the first argument, it attempts to begin by loading that construction in the appropriate geometry.
• A second argument may contain a 0, 1, 2, or 3; if valid, Geometry Playground will automatically switch to that model of the current geometry. For example, in spherical geometry, 0=sphere model, 1=plane model, 2=Mercator model, and 3=invalid (so the default model [0] would be chosen).